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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1505ac688cf1661978898abe4e3f238c2990839cacfc3fe5b43722f40411f8bc' 
  AND token = 'rzXGcuSzFBkH8/k5C/LdSMLs5I7bNTb4xPcMhxMl+9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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