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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513c2b5fb7f1b2dfd83543cefa9fc8685194c18a50bd6058444afb718b5e209b' 
  AND token = 'Plk06AH9jvb+flbEEGELKD7Njy9ksQLrPU4pWEgKiMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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