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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44db72b7283086d587f9c2e557786ece35b5b663c093db3634a79acdad3c82f7' 
  AND token = 'pyu0ig/JjECW/8uKeiwoYorb2fKPZSDSaeMLHAE8Ddc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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