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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea3551ae9fdac3e59f8b1845546c37aeb6d4787dc05cf717b0d3cb1b8b91ca3' 
  AND token = 'tV2Ijle/+YQakCo8GU7nWKC++jqoR7pV6OYndP54AqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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