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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190ab7459b290661ad7a880abd9b928c4085cd1475f264d2ad65ad63787879e2' 
  AND token = '8pnkmh0nN2WNL5P3AheYc/5vMnP3di85yS/ZURd0JyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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