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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e4df39c1ab8e95d2edb712444cd0a30107d5b18bf284e937be99a2dbe17b40' 
  AND token = '7GbvDqsq3M7Dn5gqB7+ozQpLCd0LihSAtKbJYadH/+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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