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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faafc1ff574c545878945d8737b63cf63e9b04e680c76ec93432927f6629f662' 
  AND token = 'rNzoR7b/DFEYs/FDwJIP3Ew4byqPFVX0eF0P116fQwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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