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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063551f462147fdea3e60e4c58114097b65214fe66cc4956ed75ab32da1d46a5' 
  AND token = 'CY1GgkVaTK9VYiwA0uARoUjLoPlErB5W3bLX4QpuBh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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