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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f1bf80df16c4a84d5c82289148427b858be5532f486519048e036cd9255f8f' 
  AND token = '7IjNrfGlQSzH9J4HrNzMdgpc4TzUM3dKmovOvO+oGlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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