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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05736ff06851aa2bc254459871eacf3e1cc6e1a7a9205c07b9ad670e20ec672b' 
  AND token = 'ZUuB8Ac98J1Imqr+7uvK4YToI1pQaWF9G8fi9E85ths=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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