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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7723ef2f8c9af6bc0e1613900422271dd79cb8d24c55eab640a0bb49c217875a' 
  AND token = 'm8HsN5Twx5FL6oPBttdSsNc5lGRU1I1GvzhSzUCMbCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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