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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc2ab55f066654916aa4cb8e5a706c80bd53464dbcb886da965dae62b22dd63' 
  AND token = 'oD6rY4FWY9//uPoCeIN7Ii/1AJbMrvD+EVHM62U6+Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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