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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00203561d6634acd2fbce4b3d2415deff9827d5f71b878f7486f69d79678ee1' 
  AND token = 'M3LHcVDbdSR0Y/BA1J5XebbsKSTiZN27RC1E2QcLjVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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