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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e804ee2735000b3fbc8ae028ef89bc9cf5fe9617079589e5102f39d4c1393ed' 
  AND token = 'wSZCLdtkhuFlEHMNxmpQaQOwl8qt/mR8ZsMbQAA5H1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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