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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9704d25129794245267d84d7fbb6f6ced4d381dbb904c22df860f86eb61f0434' 
  AND token = 'a36xMa/LOBmdzzyJiss/5QEx2H4TbmwkV5bPM5v8qcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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