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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76f603f9358008f4c54513563a410efe96c81bb255717b2556f4c9938b1ed70' 
  AND token = 'e5I6EwkteF+qmx8cxt4FvO5b6iC40cs9Haf8ELDxx4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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