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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b3b9d018c20ba89b52210946a0582fd14ec3cadbba1125531cd7c63db065aa' 
  AND token = '0WMUrYNLGrhMKn+xXyBdjtxDf260gsSx5Lyqr9/a684=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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