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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bce007f596d674a2db284960229d607f8f24205846c2876b4e70ab589d80d6f' 
  AND token = 'fQUuQIgMfHNDYujwH7lxsEhC4w6w0eN2kijy3nBP11A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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