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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60a7a2c58dc7e7c51e0580b58ab6a4f9f156e007a22f161672bed3960145a1c' 
  AND token = '0f3GKy6x4yUZvoFy9Q5+IygM0unbTOWVQMxjD6haLLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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