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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f9006bbe84c50f6b3e8a0c5156870cd92d0bfa2c7acf5eb185947efd2c8531' 
  AND token = 'bbRuT6pAvjb+Pbh9Ssh0lQL/z/HYt1RzOVp/zAxq5fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}