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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423b92055a4bbf8e9c73b75dd7ee83656f46956a90598bd925c616ee71ffc92e' 
  AND token = 'RRZVKd+xuk25Z7p5OKaHJrIKUQBn+iAjenj+02j/c+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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