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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad4727896d0a0b0c2399cb0d40cbf5d930bb4e45e0263330c77b86de57ad9ee' 
  AND token = '7Buxd+REGoBpmZ8ggDu3YmIxae4cmwIGV+OmmtGYFRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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