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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '001ea2619fc04e749fc739446b1f4a38aa903f43072b1a6d376691a80a14fba4' 
  AND token = '6kYORu2poytfT83eWRCEi+QP2kpqunS+gfndc83DQp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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