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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca2d84e03e3dc86fe5a8e9c844d2665b9ada7276ce4bd77dc00a6960456ac7e' 
  AND token = 'X9O34NI9Upi7Ii3kq2FuHoyl2o9/tohY3pOYhunAlew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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