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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2d9a81b59a247e7b2fa7ae5da0dc93e4abdbf852ffe29c15dd5a9563159bda' 
  AND token = 'Gv5u4X/Oblr9+Do0KKWxTBq+uLqZ67ntrnyPVJ8Uafo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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