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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f2f0c859cf4a4f384bfb74b0d164aaa4fcd24c83edc7d75acc8d0ace75122b' 
  AND token = '0g2XwYt4UOtrTysDzPgeteaqTROh7QTkW+37syWVsY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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