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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d563008f1031c5e534a7ab722b2eac7f53413f7a6242a76028eb227513bc2ec' 
  AND token = 'C4B/V6qZ0+1y/j7Jl5jT/RpIl6c4tE4MsJIxT4Sb4Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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