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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba4f5824849d34e0ba87d882b585f2dad62e7a9a0e21385541a5d04b5bda3da' 
  AND token = 'NCujU7oxvLl87wwMke5lFl7H6+9u9m/1MynRPNQvPsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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