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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180878ac2d53ee427884471219c35196c0050076335bdfbaa60b81c21cc74577' 
  AND token = 'pil6Sh0s9EmsGj7ax4kJXkoqD6KfAFg3yIocM7uuB78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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