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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52aaffb568c217e53c33de50aff8284a30ccd5ab67712509af4397835c399ed5' 
  AND token = 'Bzmno1DAkkVNWfZr2k4tO1WSJbeA1tOz7jmK+k8kSgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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