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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd4e4a8250015dfaa3cfd77dbc7277b572b12f3534304c9a6651635bca76381' 
  AND token = 'w0on+Ghsl165xlMbkjOW9TgDM8xFoRR0bbwemm5obQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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