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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe6c24885d37b5a01e78745df46aee9aed87a2405bf0803142c4bb42f30d88e' 
  AND token = 'i4mUKvGxZ7yPBTvg8GF/fP05PJZMYtINdplz+dI5nis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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