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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984edc1f96f45e7bdb143b9526f3d5862210cf546226b7e5beeae61118cd1976' 
  AND token = 'Uo9dYpCW+qiRDo9xWj/0OAq2F6yrHOoUf76zf5wghXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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