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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f100ff4617ce03a69a0246f7c62a4ae0aa883af4b5264b0dc40cf04609fb84e7' 
  AND token = '1cb7fT7zgvOxQ2MKFbvB2byRELmUPjKURW/Xj4x9ETc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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