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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac87f4fc6dcc6f96415e9afcd912ac3eab2f8778fc109502242125d6d48f43e' 
  AND token = 'esl2pfYPwIqbiwoePWI8ex1t2S5C6g77X2xnBhizj+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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