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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4660e772078b0e2c0c53490e7ac6b341b076634cbabaf43d6730b706eb94088e' 
  AND token = 'n+ZEuC8d8JlWhgLtEAmsvfmUNtDfeKrXAJsYomQacVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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