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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e658a14dd91b55f44dd03977ddea44f3c1d0c886be93096a8ac617b0cd6eebb8' 
  AND token = 'POT0AwdsZeOW5xJ4RYrzmrh75sJ7jqSdg15m1Z+Cau4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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