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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93a048abffabcbd401574b2817df0053a25223d4a690d0d16fdbe86ae2470a1' 
  AND token = 'JEVe4OLuqzbWB3Hc0p39t+BppP/t1+oBRW+vlz1QB54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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