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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1b58a40d5272d0c508952573ae311215d2285fc80efec413a62eac84d4414a' 
  AND token = 'C9zhiJ5ibcQqJTRZZNJY7DNxhecWVpoa2smr/H3p5xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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