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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155212a450249cb1f452039e8e6e94b23d7f03bfee826f9ef3f00a2348bc0848' 
  AND token = 'E7p1D5r2w2eDqq/hlKc3LUEx5Qji9BGiD6dHI+A93iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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