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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535dd06576497f3410ea2b5846157951d399738186fdd54221c4b8a807fd07f4' 
  AND token = 'q67pFKMSqxn9/pt3SIna+gpNGe4YYkZGrG2nSOPDe4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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