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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2decee9367e5bbb0a34d12e954d6c80a0cccee1c08dd33801041bb07e630b681' 
  AND token = 'kzvUKPPvrbV44G+GsLkKtkHRBzliC11i4dMXEOtQSzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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