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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fbec6ce2a8cfdb71acd3f9a2951a2b655158360262d5199624508e9dd8fa74' 
  AND token = '3zJ60fcmYHUX2wDmPYwHHMrr2mjEjMevLtbq6C2/oAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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