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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bbee03200808cfb5fe7199b31220f4fdb91e9282f0dc8619cf2996990d9d6d' 
  AND token = '20C8IcnrfrkE/jf2lfCT9HxhpLdDeR5ypMb/QFCWYfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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