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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66a77121be7036787777d21cf3ef6b6437f0098d4e05ecb92c0fc93230f90f7' 
  AND token = 'uWW6jDFimQV7W47rfPQ/y/GeTyRZi0OU1twVHAjMYAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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