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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83454eb928a1c6fcf669c20ab6f6833ef10ce29b1c0b5a28280cefc7d04ad685' 
  AND token = '9+Ugf30CqtqoNO6/ujuXWl2v43W5dTu0AkGQEK7Fb48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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