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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98e1e996acdbcd2681cea40fa8fd4c3ccb0aa1a3c8aba6a9abb057186d56eb4' 
  AND token = 'UO2lzA9hikCmXFFeUz7rolEmzb3/vTaWdGeuP4DcJH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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