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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84c63bc910712d2617667cb83d7e540e7e9693213af782a808bd656a4e5d66d' 
  AND token = 'pgF3FM78LA8CRGUfnkatCSEd+A6hGI0ltbXddMbbaT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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