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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b030b361b995f46d2cee20251b08a7b7942c48a0be691a7f553f9a8eecb91c' 
  AND token = 'fK0HCF53hGMEoN/zpl9rvbu5Fv9wFjdXYMMKSd3NDlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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