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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0cf1c19e0b98a236536189c6ac76522267765321cb954aabcb3f191df1d35a' 
  AND token = 'UAlGmUeOA4sngmhYiUcYXBnoU5gnALb9wWqGVtqNO+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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