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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10457f223bb16cdc1d12327828104902922284655c06b28e14065c712cd32b6' 
  AND token = 'sY6YyNHzzN1KS6JbRJnBxnkkMwqlFiQSosG2B4Ln9p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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