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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dba46b9dcc466d338943c847fdb288a9aabf2a4aa02a931971fecbb7468edff' 
  AND token = 'ivPCGNARi23lE/9kQpyNwxNUG5Tzv2W16N/JM4vRlJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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