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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9d8f12b7636429819e13f817736c6fc972abe239160964f15fe5360feaac02' 
  AND token = 'yew2cYx4E4e/0NWkleu32Y3T5kPJEdZIYs58lhSrqu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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