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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11e8986263daed5a9896b50ad34b6a19ec76185339feebf09a6de2e13878811' 
  AND token = 'Q+EEW6BuZKPffqfMx6Yb7A960lIcpv1q8+BH1egA+Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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