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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9706364385ece1fbb545059a826a58d6668081a2e81dba6e6033fbd85824f933' 
  AND token = 'DqYkVGY4nGc0CnQTWuNWLmmoeWLoukEZzieA4ppQUik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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