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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8c875bff0a2b5f0e70f62099563a11c25f542d0bae2c025a64542a313b10f9' 
  AND token = 'L0jcGBVDl5AD3oi6Y7oP3NppJuixBh3qO9aFqn88Ols=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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