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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303e065e854ee7bc2578b69dede83ff8b6bb7fcbe44be2ab272bd811194e3dc5' 
  AND token = 'rTshiGsVPYffjRHZAplHIZ9YAiUIhIaBQISy4euKShU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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