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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a453a3f446467a261adcf66c051365d95c07d5771da982427958eaaeb920d8e' 
  AND token = 'JIiM9lttd6fOVe3mNhm+8IX/kEbVLVLSnuT75v6a93E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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