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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f4d027b6f5e73107aa6f1f478bb6cd8e9f373f1eac5104570259837b88cd55' 
  AND token = 'drTIT+QKq9vZEiz9La+vZa8o3P1S0iHctbsNSW2Q3p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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